樋型炉でのソーダ灰による溶銑連続精錬と溶銑, スラグの混合特性

概要

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The multi-stage steelmaking process with soda ash (Na_2CO_3) was proposed. Dephosphorization and desulphurization of hot metal, the most important unit processes in the process, were studied. Experiments on the continuous refining of hot metal with Na_2CO_3 were carried out using the trough-type continuous refining furnace. The furnace was divided in two chambers and the first (upper stream) chamber was provided for desiliconization with oxygen and iron ore and the second one was for dephosphorization and desulphurization with Na_2CO_3. In the second chamber the hot metal and slag flowed in counter currents. The furnace was able to process the hot metal at a rate of 45t/h and the refined hot metal was transported to the steelmaking shop. The operation for 120 hours in campaigns proved the stability in reaction temperature and low wear rate of the refractory in the refining section. By analysing the tracer concentration in the exit stream with the mixed model, Peclet numbers for the hot metal and the slag flows were estimated as 6.7 and 2.0 respectively.
社団法人日本鉄鋼協会の論文
1983-10-01